erf erff erfc erfcf - error function operators
Lb libm
The
erf ();
and the
erff ();
functions calculate the error function of x; where
erf(x) = 2/sqrt(pi)*integral from 0 to x of exp(-t*t) dt.
The
erfc ();
and the
erfcf ();
functions calculate the complementary error function of
Fa x ;
that is
erfc ();
subtracts the result of the error function
erf (x);
from 1.0.
This is useful, since for large
Fa x
places disappear.
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